Boring and facing tool with feed attachment



A ril 25, 1933. M. P. DOYLE 1,905,319

- BORING AND FACING TOOL WITH FEED ATTACHMENT Filed lay 1a, 1951 TTO NEYS,

Y 9 vgu Patented Apr. 25, 1933 UNITED STATES PATENT OFFICE MICHAEL P.DOYLE, or" Bnooxmm, raw xom;

9 v BORING AND FACING- TOOL WITH FEED ATTACHMENT Application filed Kay13,

may be positively fed against the valveseat and positioned with respectthereto so that a required degree of cut may be accomplished 10 and whenthat degree of out has been completed the operation of the tool willcease to feed the cutter towards thevalve seat.

A further object of the invention isto pro-- vide a tool of thischaracter whereby the said tool is made adaptable for use in refacing'valve seats in various types and sizes of valvecasings,or reboringcylinders on gasoline engines. I a

A further object of the invention is-to rovide a device of thischaracter which wi be highly efficient, durable in operation and sturdyin construction. d

Other features and advantages of my invention will, hereinafter appear.

In the accompanying drawing:

Figure 1 is aview in elevation, mainly in section of my improved tooland showing it in operative position on a valve casing;

Fig. 2 is a transverse section of Figure 1 as seen along theplaneindicated by the line 22 in Figure 1 and looking in the directionof the arrows;

Fig. 3 is a plan view of a portion of the mechanism of the tool. a

In describing the invention, reference will be made to the drawing bysimilar characters placed on corresponding parts throughout. the severalviews.

In illustrating my improved refacing tool, 40 I have shown the sameapplied to an ordinary type. of valve casing 1 having a valve seat 2therein and from which seat extends an attaching neck 3. The valvecasing is shown with an opening 4 which is normally adapted to be closedby a cover plate. The casing is also provided with the usual threadedopenings 5 adapted to receive the securing bolts or studs for the valvecover.

While I have shown my tool as applied to a particular type of valvecasing, it is to be 1931. Serial No. 536,965.

understood that the same may be applied to a number of different typesof construction of valve casings and is not limited for use inconnection with the one illustrated in the drawing.

The refacing tool is adapted to be secured to the valve casing by meansof a support or brace 6 formed with the extensions 7 7 These extensionshave elongated slots 8 and are adapted to be secured to the casing by Imeans of thezscrew threaded bolts 9 which are inserted into the threadedopenings 5 of said casing." The support or brace 6 is provided with aninteriorly threaded neck portion 10 which is adapted to'receivethe-reduced threaded portion of a hollow tubular member 11.

This particular construction of the support or brace 6 makes the tooladaptable so that it may be fitted to any gasoline engine 7 by means ofa reducing nipple and to be used for boring out the cylinders of thesame or for facing the valve seats or worn valve chambers in pumps.

The bridge eflect produced by means of 7 the construction of the supportor brace 6 also allows the operator of the tool ample room to reach intothe valve casing to connect or remove the cutting element employed orany other of the parts of the tool which extend down into the casingwithout the necessity of removing the tool from its posi- "tion withrespect to the valve casing. This particular construction of the supportor brace also enables the operator to see the op- 95 eration of thecutter within the valve casing.

Extending through the tubular member 11 i is the shaft 12 which isformed at its upper end with the angular portion 45 and at its lower endwith the tapered opening 16. The shaft 12 also is formed with the collar13, said collar being positioned so that it will have a bearing contactwith a fiber washer 15 positioned' against the inner face of the hollowtubular nut member 14.

The tubular hollow nut member 14 is interiorly threaded and is adaptedto be received on the exteriorly threaded portion of the hollow tubularmember 11.

The tapered opening 16 of the shaft 12 is a slot 21 which-is adapted toreceive a tool or instrument therein above the. end of the .ing to thedepth of the valve casing in contapered portion of the shaft 17 whensaid shaft is wedged -into place in the tapered opening 16 of shaft 12so that said shaft 17 may be forced out of its wedged connection withshaft 12 when desired.

The shaft 17 is adapted to have removably connected therewith, in itsthreaded open end, the cutting tool 22 carrying the cutter 20. The saidcutter 20' is positioned through a radially disposed slot in the shaftof the tool and is maintained in its proper cutting position by means ofa suitable wedge 24.

The shafts on which the cutter 20 is positioned may be of any desiredlength. and different lengths of said shafts are used accordnection withwhich the tool is being used.

The cutting tool has the extension 26 to which is secured in anysuitable manner the centering spider designated generally at 27.

The said spider is formed with the three hollow projecting arms 2 8,-29and 30. Each of these arms are interiorly threaded so as to receive thescrew threaded bolts 31. ,The bolts 31 are provided with the pointedheads 33 and may be adjusted with respect to the threaded arms 28, 29and and held in adjusted position by means of the lock nuts 32. Each ofthe arms of the spider are provided with a pit point 34. Each of thesepoints is positioned at an equidistant point from the end of said arms.Y

Secured to the head portion 15 of the nut member 14 many suitable manneras at 35 is the outwardly extending arm 36 having slidably mountedtherein at its free end the square pin 37, with enlarged ends 37 The pin37 may be held in any desired position 1with respect to the arm36 bymeans of a ey 38. F One face of square pin 37 is formed with a roundedportion 37", said rounded portion extending downwardly from the top ofpin 37 to about half way of its length. Mounted on the shaft 12 abovethe nut 14 is a collar 39. This collar is secured to shaft 12 by meansof a taper pin 38 which is adapted topass through said collar and shaft.Between the collar and the nut 14 is provided a iiber washer 39.

The collar 39 is provided with a hollow exteriorly threaded extension 40which is adapted to receive therein the pin 41. The

pin 41 is provided with a shoulder 42 and is yieldingly maintained inthe opening of threaded extension 40 by means of the internally threadednut 43 which is adapted tobe screwed on the threaded portion ofextension 40 of collar 39 and by the spring 44 which is positioned so asto abut against the shoulder 42 of the pin 41 and the end of the collarextension 40. The nut 44 is provided in con-' junction with theinternally threaded nut 43 to regulate its position with respect to thecollar extension 40.

In applying my tool to the use for which it is intended I first selectthe proper length of shaft 22, with its cutter member and extension 26secured thereto, which will properly position said cutter with respectto the valve seat to be refaced. This shaft-22 is socured to the shaft17and the tapered end of The centering'spider member is then positionedwith respect to the interior of the neck 3'sothat the shaft 13.isaccurately centered in the valve casing and the cutter-is positioned inproper. cutting relation with the valve seat. This is accomplished bymanipulating the nuts 32 and the screw bolts 31 so that the ointed endsof the heads of said bolts will e equidistant from the pin pits 34 inthe arms 6 the spider when they are in engagement with the side walls ofthe neck 3.

The proper eqpal distances may be measured by any suita le instrumentusing the pit points 34as one point and the side walls of the neck 3 asthe other pgint in the positioning operation.

When the tool has been properly centered by means of. the positioning ofsaid spider the bolts or screws 9 are then placed through the slots 8 ofthe extensions 7 of the brace 6 and the tool secured to the valve casingso as to prevent any improper vibration or movement'during the operationthereof.

The shaft 12 is then rotated by the handle which has been engaged withthe end 45 thereof and such rotation is imparted to the Y 40 to rotatetherewith and the end of the pin 41 will engage with the rounded portion37"- of the square pin 37 secured in the end of the arm 36 and thuscause the nut 14 to rotate downwardly on the screw threaded tubularmember 11. As the nut 15 moves downwardly the shaft 12also movesdownwardly causing a greater pressure to be placed upon the cutter 20against the face 0 the valve seat and thereby causing said cutter tomake a cutting pass over the face of the valve seat.

When the cutter 20 has been fed against the valve seat face in makingits cutting pass, by the downward pressure thus exerted to it to theextent that it resists such pressure, the further rotation of the shaft12 will cause the rounded .end of pin 41 to be forced inwardly againstthe action of spring 44 by reason of its contact with the roundedportion of pin 37 and it will thus .slide past the rounded portion ofpin 37. The downward rotation of the nut 14 thus will be arrested untilthe end of pin 41 is again brought into contact with the pin 37 by thefurther rotation of shaft 12.

When the downward rotation of the nut 14,is thus arrested the cutterhaving made its cut in the valve seat the same will not make anothercutting pass until the nut 14 is again caused to move downwardly byreason of the rotation of arm 36 by means of the pin 41 engaging the pin37.

If desired at any time the square pin may be released from itscontacting position in arm 36 by unloosening the pressure thereon asapplied by the key 38 and said pin may be allowed to drop below the athof the pin 41 as the shaft 12 is rotate When this is done, of course,the nut member 14 will not progress downwardly on the threaded part ofsaid member 11 as shaft 12 is rotated and the cutter 20 will merely passover the surface of the valve seat without any pressure being i appliedto it. t

It will be seen that by the construction of tool above described andillustrated in the drawing, the cutter can be accurately positioned withrespect to the valve seat and any desired depth of cut for refacing thevalve seat may be made with the cutter and when such out has beenaccomplished the cutting action of the cutter may automatically bestopped.

It is also obvious that valve seats of any number of types of valvecasings maybe trued or reshaped and by reason of the facility ofapplying different lengths of extensions to the shaft 12 and that inthis respect the tool is highly advantageous and useful.

. Various slight changes may be made in the general form of the partsdescribed without departing from my invention, and, hence, I

do not limit myself to the exact details set forth but consider that anyvariations within the spirit and scope of my invention are equallycomprehended bythe foregoing disclosure.

What I seek to secure by United States Letters Patent is: V

1. A tool of the class described comprising a support adapted to beadjustably secured to the valve casing and having an upward-.

opening therethrough, and mounted on said threaded'tubular extension andadapted to be rotatably moved with respect thereto, a shaft havingrotary mountingin said support and extending through said threadedextension and the opening in the head portion of said tubular element, acollar in.- tegrally secured to said shaft and positioned within thehollow interiorly threaded element so as to contact with the interiorface of the head portion thereof, an arm secured to and extendingoutwardly from the head portion of said tubular element and slidablycarrying at its outer end ,"a square pin with a rounded portionformed-thereon, means secured to said shaft adapted to engage said pinwhen said shaft is rotated and to cause the said pin and its associatedarm and the tubular element to be rotated with said shaft so as to causesaid tubular element to-be moved downwardly along the threaded portionof the exteriorly threaded tubular extension of said support and thuscause said shaft to move downwardly into the valve cured to the lowerend of said shaft, a cutting tool removably secured to the lower end ofsaid extension shaft and provided with a cutting element positioned soas to contact with the valve seat of said valve casing when said firstmentioned shaft ,is moved downwardly by the downward progression of saidtubular element on the threaded extension of said support, and meanssecured to the lower end of said cutting element to center said toolwith respect to the valve casing and its valve seat. v

2. A tool of the class described comprising a supporting means forsupporting and securing said tool in operative position with respecttothe opening in a valve casing, an exteriorly threaded tubular membersecured to said supporting means, a shaft having rotary mounting in saidsupporting means and in said exteriorly threaded tubular member andadapted to extend downwardly into the interior of the valve casing, anextension shaft removably secured'to the lower end of said shaft, acutting tool removably secured to the lower end of said extension shaftand comprising a shaft having a cutter element and a positioning elementmounted thereon,

said cutter element being positioned on said of the casing below thevalve seat, a tubularinteriorly. threaded nut rotatively mounted on saidexteriorly threaded tubular member secured to said sup ort, said tubularthreaded nut being provi ed with an outwardl extending arm, an abutmentpin sli ably mounted in the end of said arm, a collar 5 formed on saidshaft and positioned so as to ,have contact with the interior face ofthe head portion of said tubular nut, a collar fixedly secured to saidshaft above said tubular nut and positioned so as to have bearingcontact with the upper and outer face of the headof said nut, saidcollar being provided with a tubudar exteriorly threaded extension 11pin mounted in said tubular extension of said collar and positionedsothat it.w-ill en- 15 gage with said abutment pin, and means ad-vustabl secured to said extension-for hold ing sai pin in yieldingcontact with a spring in said tubular extension, means on said shaft forrotating the same and its connected partsincluding the cutter in saidsupport and to cause said pin to abut a inst said abutment pin and causethe rotation of'said nut downwardly on the threads of said tubularextension and thus cause the cutter tobe positively fed with a bearingcontact against the valve seat until said resilient pin is forced pastthe said abutment pin. 1 In testimony whereof I have hereunto set myhand on this'.12th day of May, A. 1)., '1931. i

' MICHAEL P. DQYLE.

